A sonar target locking system to position a sonar assembly to maintain the sonar array of the sonar assembly pointing at a position of a user-set (desired) target even when the watercraft is rotating or moving in various motions. The sonar target locking system includes electro-mechanical assembly that can be steered electrically to maintain the sonar array pointing at the position of the desired target. The system may be activated using at least one of a foot pedal, handheld remote control, or a display of a fish finder head unit. The system may use GPS and IMU inputs to generate control signals to steer the electro-mechanical assembly to maintain the sonar array pointing at the position of the desired target.

A sonar target locking system to position a sonar assembly to maintain the sonar array of the sonar assembly pointing at a position of a user-set (desired) target even when the watercraft is rotating or moving in various motions. The sonar target locking system includes electro-mechanical assembly that can be steered electrically to maintain the sonar array pointing at the position of the desired target. The system may be activated using at least one of a foot pedal, handheld remote control, or a display of a fish finder head unit. The system may use GPS and IMU inputs to generate control signals to steer the electro-mechanical assembly to maintain the sonar array pointing at the position of the desired target.

A sailboat race tracking system includes a race computer, and a sailboat computing device authenticated to the race computer. The sailboat computing device transmits position data as a function of time to the race computer. An event organizer computing device sets a race start time and transmits the race start time to the race computer. The race computer receives the position data as a function of time from multiple sailboat computing devices and syncs it according to the race start time. The race computer transmits the time-synced position data of the sailboat computing devices to the sailboat computing devices and spectator computing devices for display.

A usage management system includes a use rights management server and a user terminal. A controller of a vessel propulsion apparatus operates a prime mover in a permission mode to permit an output exceeding a predetermined limit output if use permission is provided from the user terminal, and operates the prime mover in a non-permission mode to prohibit an output exceeding the predetermined limit output if use permission is not provided from the user terminal. The user terminal enters an active state to allow issuance of use permission if a use-permission notification is received from the use rights management server, and enters a non-active state to prohibit issuance of use permission if a use-permission notification is not received from the use rights management server. The use rights management server transmits a use-permission notification or a use-non-permission notification in accordance with use rights information concerning the vessel propulsion apparatus.

A usage management system includes a use rights management server and a user terminal. A controller of a vessel propulsion apparatus operates a prime mover in a permission mode to permit an output exceeding a predetermined limit output if use permission is provided from the user terminal, and operates the prime mover in a non-permission mode to prohibit an output exceeding the predetermined limit output if use permission is not provided from the user terminal. The user terminal enters an active state to allow issuance of use permission if a use-permission notification is received from the use rights management server, and enters a non-active state to prohibit issuance of use permission if a use-permission notification is not received from the use rights management server. The use rights management server transmits a use-permission notification or a use-non-permission notification in accordance with use rights information concerning the vessel propulsion apparatus.

A method for evaluating a securing system for a floating structure, where the method includes collecting a plurality of metocean data from a plurality of metocean sensor devices during a current time period coinciding with a field operation, where the field operation is conducted from the floating structure that is stabilized by the securing system. The method can also include evaluating the metocean data using a plurality of algorithms. The method can further include determining, based on evaluating the metocean data, a condition of the securing system at the current time period.

The invention relates to a method for managing maintenance for a ship comprising a sealed and thermally insulating tank for transporting liquefied gas. The method comprises the steps consisting in determining 310 a current filling level of the tank, determining 320 a current state of movement of the ship, determining 330 a current sloshing index IBi from the current filling level of the tank and the current state of movement of the ship, taking into account the position and the geometry of the tank, integrating 340 the determined current sloshing index IBi into a wear index IUi that takes into account a history of the sloshing indices. The wear index is then compared to a threshold in order to indicate if the tank needs to be inspected, depending on the result of the comparison.

A watercraft includes a steering operator to be operated by a user to steer a watercraft, an operation amount sensor to detect an operation amount of the steering operator, a steering device including a steering actuator to change a steering angle, a steering angle sensor to detect the steering angle, and a steering controller configured or programmed to control the steering actuator according to an output signal of the operation amount sensor and an output signal of the steering angle sensor. The steering controller is configured or programmed to monitor the output signal of the steering angle sensor for an abnormality, feedback-control the steering actuator based on the output signal of the steering angle sensor to achieve a target steering angle when the abnormality is not detected, and feedforward-control the steering actuator based on the output signal of the operation amount sensor when the abnormality is detected.

A system includes a vision system camera mounted to a marine vessel with an associated field of view of the vessel's environment. The system receives image data from the camera and identifies waves in the marine vessel's environment based on the image data. When the system determines that a wave's height exceeds a threshold and that the current heading of the marine vessel is misaligned with the wave's heading, the system automatically adjusts the vessel's heading to align more closely with the wave's heading.

A craft comprises a hull, a wing, a hydrofoil, and a control system. The wing is configured to generate upwards aero lift as air flows past the wing to facilitate wing-borne flight of the craft. The hydrofoil is configured to generate upwards hydrofoil lift during a first mode of operation as water flows past the hydrofoil to facilitate hydrofoil-borne movement of the craft through the water. While the craft is hydrofoil-borne, the control system is configured to determine the upwards aero lift generated by the wing. The control system is further configured to control the hydrofoil to generate downwards hydrofoil lift to counteract the upwards aero lift generated by the wing that maintains the hydrofoil at least partially submerged in the water while the determined upwards aero lift is below a threshold lift.